3 Phase calculation help

[The hurricane]

Hi

I've been asked to look at a job last minute. It involves a 3 phase supply and I cant for the life of me get my head around the calcs. (not really worked anything out 3 phase for a good few years)

Only info to go off at the min is a 22KW Chicken Rotisserie. Run is approx 20M clipped direct.

Any help appreciated, Thanks

 

[ProDave]

What do you want to know?

Assuming the load is split evenly between the three phases (you need to check) that's simply 7.333KW per phase or about 32A per phase.

 

[The hurricane]

In all honesty I've probably confused myself by googling too much.

Think I just needed somebody else to tell me what I already knew.

 

[binky]

happens that way sometimes. I like to translate to something simple, like the above is 3 old very electric showers so 4mm probably OK but 6mm is probably better as it will run for quite a few hours. From that I then go do the proper calcs, if you see what I mean.

 

[steptoe]

happens that way sometimes. I like to translate to something simple, like the above is 3 old very electric showers so 4mm probably OK but 6mm is probably better as it will run for quite a few hours. From that I then go do the proper calcs, if you see what I mean.

thats what I do

 then I'll actually calc it if I feel the need,

like (very basic) rule of thumb, 4amp per KW [even though its not]

 

[Tony S]

Split the load in to three parts (kW/3) and use ohms law for the current based on Ph→N voltage.

 

[Evans Electric]

You could do :

KW  X  1000

V X 1.73 X pf

Just under 40 A

A chicken rotisserie you say ..... so probably runs all day long in a hot commercial kitchen  ... I'd go with a 10 mm2  X 4c  SWA  myself .